Same handout, Same player, Different computer, Different content

I have an extremely strange behavior I'd like to report. I have a handout which I took great pains to obscure parts of the player facing content. Translating it to elvish script. In the GM notes, I have the full text, in a normal font. When I made this handout visible to the players today, one player saw the full content. He couldn't see the GM notes section, he just saw that content in the part of the note that should be visible to all players. Even stranger, when I logged in as that same player on a different computer. (I have access to that player's account - he's my son.) I saw the properly obscured and elvish-ified note. I've tried this on both FF & Chrome on both computers and get consistent behavior. On computer A, the full text is visible in the note, on computer B, the obscured text is visible. These are both Win10 machines. I can provide browser version numbers but given that it's happening cross browser, I don't think that's the issue.

I think I've figured it out. I haven't installed the Elvish font on the other computer, so it's just rendering the original text using the default font. At one point, I'd taken a screenshot of the elvish version of the note and uploaded that as an image instead of having text. It was a little blurry, so I instead pasted in the elvish text. I should have just left the screenshot.